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WO2008091499A1 - Maillon principal pour piste de machine et procédé - Google Patents

Maillon principal pour piste de machine et procédé Download PDF

Info

Publication number
WO2008091499A1
WO2008091499A1 PCT/US2008/000409 US2008000409W WO2008091499A1 WO 2008091499 A1 WO2008091499 A1 WO 2008091499A1 US 2008000409 W US2008000409 W US 2008000409W WO 2008091499 A1 WO2008091499 A1 WO 2008091499A1
Authority
WO
WIPO (PCT)
Prior art keywords
link
link member
master
tooth
track
Prior art date
Application number
PCT/US2008/000409
Other languages
English (en)
Inventor
Richard E. Livesay
Faraz Hussain
Donovan S. Clarke
Richard L. Buxton
Thomas E. Oertley
Nishith D. Sanghvi
David A. Lapen
Michael Poremski
Original Assignee
Caterpillar Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caterpillar Inc. filed Critical Caterpillar Inc.
Publication of WO2008091499A1 publication Critical patent/WO2008091499A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/18—Tracks
    • B62D55/20—Tracks of articulated type, e.g. chains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/18—Tracks
    • B62D55/20—Tracks of articulated type, e.g. chains
    • B62D55/205—Connections between track links
    • B62D55/21—Links connected by transverse pivot pins
    • B62D55/213—Master track links

Definitions

  • the present disclosure relates generally to master links used in machine tracks, and relates more particularly to a single tooth master link configuration and method wherein profiled sinusoidal surfaces of separate link members of the master link together define a mating interface for transmitting loads through a machine track.
  • one or more teeth are provided on separate link portions, the link portions being mated together such that the teeth interlock with one another.
  • Fasteners such as dowels, bolts, etc. may be used to secure the respective link portions together, and the master link positioned in a machine track where it operates much like any of the other links.
  • the fasteners coupling the link portions together are removed, allowing the track to be separated via disassembling the link portions. While the basic two-part master link approach has proven to be quite useful, the ruggedness of many environments within which tracked machines operate can mandate specialized features for master links, as well as place a premium on durability and service life.
  • interlocking teeth are commonly used to couple together link portions of master links.
  • the number, spacing, orientation, etc. of teeth in multi-piece toothed master link strategies may vary, and engineers have experimented with numerous different designs over the years. It has been discovered that in certain instances, a single tooth design provides a practical strategy, obviating the machining time requirements relating to numerous teeth, as well as having other advantages.
  • a typical "single" tooth design actually has a tooth and pocket on each of its two link portions. The tooth of each link portion fits into the pocket of the other link portion.
  • Fasteners are used to couple the link portions together, often slightly deforming or displacing the components to provide a snug fit and retention of the fasteners themselves.
  • a problem with many known single tooth and multi-tooth designs relates to the tendency for stress concentrations to be inherent in the components. Particularly where relatively complex geometry and numerous machined surfaces provide the interface between link portions of a master link, relatively sharp corners and other features can serve as stress concentrators. When actually placed in service, stress concentrations within and among the components of a master link can lead to failure after a significantly shorter service life than that of the track itself. In other words, the master link may fail before a desired time for disassembling the track, depending of course on the operating conditions.
  • the present disclosure provides a master link for a track of a machine.
  • the master link includes a first link member having a first end with a strap, a second end and a profiled surface.
  • the profiled surface includes a first slope transitioning to a second slope via a sinusoidal segment defined by a tooth and an adjacent recess adjoining the first and second slopes, respectively.
  • the master link further includes a second link member also having a first end with a strap, a second end and a second profiled surface which is configured complementarily to the profiled surface of the first link member.
  • the respective profiled surfaces together define a mating interface between the first and second link members for transmitting loads between the first and second link members.
  • the present disclosure provides a machine having a frame with a plurality of rollers, a track coupled with the frame and including a plurality of links forming an endless chain extending about the rollers.
  • the machine further includes at least one master link including one of the links of the track, the at least one master link having a first link member coupled with a second link member, each of the first and second link members including a profiled surface.
  • the respective profiled surfaces together define a mating interface between the link members for transmitting loads through the track, each of the profiled surfaces including a first slope transitioning to a second slope via a sinusoidal segment defined by a tooth and an adjacent recess adjoining the first and second slopes, respectively.
  • the present disclosure provides a method of reacting loads through a track of a machine, including the step of applying a load to a strap of a first link member of a master link in a track of a machine.
  • the method further includes the step of transferring the load to a second link member of the master link via a mating interface between the first and second link members defined by first and second abutting profiled surfaces which each include a first slope transitioning with a second slope via a sinusoidal segment defined by a tooth and an adjacent recess adjoining the first and second slopes, respectively.
  • Figure 1 is a side view of a machine according to one embodiment
  • Figure 2 is a diagrammatic side view of a master link according to one embodiment
  • Figure 3 is a perspective view of one component of the master link shown in Figure 2;
  • Figure 4 is a perspective view of the master link shown in Figure 2;
  • Figure 5 is a perspective view of another component of the master link shown in Figure 2;
  • Figure 6 is another perspective view of the master link shown in Figure 2;
  • Figure 7 is a diagrammatic side view of a master link according to another embodiment
  • Figure 8 is a top view of the master link shown in Figure 7;
  • Figure 9 is a perspective view of the master link shown in Figures 7 and 8. Detailed Description
  • Machine 10 includes a frame 12 having a first track 14 disposed at one side thereof, and a second track (not shown) disposed at the other side thereof.
  • first track 14 disposed at one side thereof
  • second track (not shown) disposed at the other side thereof.
  • Track 14 may extend about a plurality of rolling elements such as a drive sprocket 24, a front idler 26 and a rear idler 26, as well as a plurality of conventional track rollers 19.
  • machine 10 is illustrated in the context of a track-type tractor, it should be appreciated that the present disclosure is not thereby limited, and a wide variety of other machines having tracks are contemplated within the present context. For instance, a conveyor, a track for transmitting torque between rotating elements, and still other applications are contemplated. Further, while tracks of the type commonly used with tractors such as machine 10 will often include dual sets of coupled together links 16, one of which is shown in Figure 1, the present disclosure is also not thereby limited. In all embodiments, however, machine 10 and track 14 will include a specialized master link 20 configured to enable relatively simple breaking of track 14 for repair of track 14 or other components of machine 10, servicing, shipping, etc., without sacrificing robustness or service life.
  • Master link 20 is of the type generally known in the art as a single tooth master link, and may include a first link member 22a and a second link member 22b, each configured to couple with a separate link 16 of track 14.
  • a ground engaging plate 21 may be coupled with one of link members 22a and 22b.
  • Track 14 might include dual sets of coupled together links 16 extending about the respective rollers, each of the sets of links having a master link such as master link 20, although only the outermost of one of these sets of links is shown in Figure 1.
  • Figure 2 there is shown a side diagrammatic view of master link 20, shown inverted relative to the orientation shown in Figure 1.
  • Each of link members 22a and 22b may include a first end 29a and 29b, respectively, and a second end 31a and 31b, respectively.
  • each of link members 22a and 22b may comprise a strap 30a and 30b which is configured to engage with and support one of a bushing and a pin (neither shown).
  • first link member 22a includes a bushing strap 30a
  • second link member 22b includes a pin strap, however, the configuration might be reversed in other embodiments.
  • Bores 32 and 34 may be provided in each of link members 22a and 22b, respectively, for engaging with the corresponding bushing/pin, which in turn facilitate coupling with adjacent links or other track components. It should be appreciated, however, that in other embodiments, some other coupling strategy with adjacent links, or some other track configuration not using bushings or pins and the like may be implemented.
  • each set of coupled together links 16 might include a plurality of master links.
  • a set of two fasteners 36 are provided for coupling link members 22a and 22b together.
  • Fasteners 36 may be positioned within bores 38a and 38b which each extend through link member 22a and partially through link member 22b, the separate portions of bores 38a and 38b in the respective link members being configured to align with one another when link members 22a and 22b are mated together.
  • bores 38a and 38b are disposed at different positions relative to a length L, or length dimension, of master link 20.
  • bores in separate link members may be disposed side by side at similar positions relative to a length dimension of the respective master link.
  • Fasteners 36 may also be used to secure plate 21 with master link 20.
  • fasteners 36 in conjunction with the further configuration of master link 20 described herein, will allow master link 20 to be assembled and/or disassembled quite readily with simple hand tools, in contrast to certain earlier designs requiring the use of a hydraulic press or the like. As such, field maintenance, repair or servicing may be possible with master link 20 in a manner not practicable in other designs, without sacrificing strength, although it is contemplated that master link 20 may itself have a service life as long as, or longer, than track 14.
  • Each of link members 22a and 22b may include a profiled surface 50a and 50b, respectively, together defining a mating interface between link members 22a and 22b for transmitting loads between link members 22a and 22b, and consequently for transmitting loads through track 14.
  • the respective profiled surfaces 50a and 50b may have complementary profiles, in other words as illustrated in Figure 2 their profiles may be substantially mirror images of one another.
  • the footprints of surfaces 50a and 50b may differ somewhat, however, as further described herein. While the following description focuses on profiled surface 50a of link member 22a, it should be understood as referring also to profiled surface 50b of link member 22b, except as otherwise indicated.
  • Profiled surface 50a may include a first slope 52 extending generally diagonally downward from second end 31a and transitioning to a second slope 54 which may be parallel with first slope 52 and extends generally diagonally upward from the vicinity of strap 30a. Transitioning of first slope 52 to second slope 54 may be via a sinusoidal segment 56 of profiled surface 50a. Sinusoidal segment 56 may be defined by a tooth 42a and a recess 40a of link member 22a. Tooth 42a and recess 40a are adjacent one another, and adjoin first slope 52 and second slope 54, respectively.
  • profiled surfaces 50a and 50b are configured with complementary profiles and define a mating interface between link members 22a and 22b.
  • relatively small spaces 41 may exist between the tooth and recess of one of link members 22a and 22b and the respective recess and tooth of the other one of link members 22a and 22b.
  • Spaces 41 may be symmetrical about centerlines Ci and C 2 .
  • bores 38a and 38b may span a relatively small end portion of spaces 41 at approximately a point where the corresponding slope 52, 54 transitions to a radius defined by the adjoining tooth 42a or recess 40a.
  • bores 38a and 38b This has been found to be an optimal positioning for bores 38a and 38b in at least certain embodiments, which tends to be affected by several factors. On the one hand, they cannot be located too close to straps 30a and 30b, nor can they be located too close to one another, as in either case, strength of link members 22a and 22b may be affected. Optimal positioning of bores 38a and 38b is also affected by heat treating of a rail 70, identified in Figure 5, as tapping bores through heat treated metallic material tends to be difficult given its hardness.
  • sinusoidal should not be understood to mean that a perfect sine wave is defined by the profile of surface 50a in its sinusoidal segment, however, to achieve certain of the goals of master link 20 profiled surface 50a may have certain characteristics of a sine wave, as further described herein.
  • sinusoidal segment 56 may comprise approximately one period of a sine wave, and may comprise less than one period of a sine wave in other embodiments.
  • Each of tooth 42a and recess 40a may include a vertical centerline Ci and C 2 , as shown in Figure 2, and may be symmetrical about the respective centerline.
  • Each of tooth 42a and 42b may further define a radius, which are parts of sinusoidal segment 56, each of the radiuses blending with the corresponding adjoining slope 52 and 54, respectively.
  • Sinusoidal segment 56 may include a middle segment 55, having a length which extends approximately between a maximum point of sinusoidal segment 56 and a minimum point of sinusoidal segment 56, the maximum and minimum points lying at an intersection of centerlines Ci and C 2 with recess 40a and tooth 42a, respectively.
  • Middle segment 55 which may further include a relatively short flat, may have a profile overlapping with the radiuses defined by tooth 42a and 42b over a majority of its length.
  • middle segment 55 may consist of a segment of profiled surface 50a which is made up predominantly by portions of profiled surface 50a which follow the radiuses of tooth 42a and recess 40a, any flat portion of middle segment 55 constituting less than a majority of its length.
  • no portion of middle segment 55 consists of a flat, and middle segment 55 will overlap the radiuses defined by tooth 42a and recess 40a along its entire length, having an inflection point at a midpoint of its length.
  • Middle segment 55 may be blended with the radiuses defined by tooth 42a and recess 40a, respectively. Controlling the size of any flat portion of middle segment 55 as described allows the size of the radiuses defined by tooth 42a and recess 40a to be maximized, for stress distribution purposes.
  • link member 22a has a non-uniform width. It has been discovered that tailoring the width and/or the footprint of each of the link members 22a and 22b in a particular manner, described herein, can increase the relative strength of master link 20, while keeping the parts relatively easy to manufacture.
  • the footprints of link members 22a and 22b may include non-overlapping portions.
  • Link member 22a may include a first width Wi in the general vicinity of strap 30a which transitions to a second, larger width W 2 approximately in the region of bore 38a via a radius Rj.
  • Link member 22b may also include a width in the region of bore 38b which is relatively larger than width Wj.
  • each of link members 22a and 22b is enlarged in thickness in its center in regions around bores 38a and 38b.
  • radiuses Ri and R 2 which define the thickening of link members 22a and 22b in directions away from straps 30a and 30b and toward second ends 31a and 31b, respectively, may provide for a relatively more gradual increase in thickness than that at the opposite ends of link members 22a and 22b.
  • master link 220 may include a first link member 222a and a second link member 222b, each having a profiled surface 250a and 250b, respectively, configuring to together provide a mating interface between link members 222a and 222b for transmitting loads between link members 222a and 222b, and thereby transmitting loads through a track wherein master link 220 is used.
  • Each of profiled surfaces 250a and 250b includes sinusoidal segments similar to those of master link 20, but typically including no flat portion at all.
  • First and second link members 222a and 222b each include first ends 229a and 229b, respectively, second ends 231a and 231b, respectively, and bores 238a and 238b, each of bores 238a and 238b being located in part within each link member 222a and 222b.
  • Each of link members 222a and 222b also includes a tooth 242 and recess 240, each defining a radius that comprises approximately one half of the sinusoidal segment of the respective profiled surfaces 250a and 250b.
  • Master link 220 differs from master link 20, among other things, in that bores 238a and 238b are disposed in a side by side arrangement at the same position relative to a length L of master link 220.
  • master link 220 includes a side lug 260 defined in part by each of link members 222a and 222b. Side lug 260 protrudes outwardly from master link 220 such that it can be engaged by a toothed rotating member of a track, such as track 14 of machine 10 shown in Figure 1. A radius matching the tooth in a sprocket may form the top of the lug.
  • a protruding foot 262 may extend down from a center portion 263 to contact a track shoe or the like.
  • bore 238a may be disposed in side lug 260, whereas the other bore 238b may be disposed in a main body of master link 220.
  • Incorporating lug 260, and thickening of link members 222a and 222b in their centers as shown, provides for a relatively large amount of material about bores 238a and 238b.
  • the radiuses which transition from ends 229a and 229b toward the full width center portion of the link can be relatively larger, at least by a factor of one and one half, than certain earlier designs, further assisting in stress distribution in master link 220.
  • Master links 20 and 220 may be suitable for use in a wide variety of tracks, however, it is contemplated they may be best suited to different track types relative to one another. Master link 20 may be used where adjacent track links are coupled together in an alternating arrangement, as will be apparent from the relative offset of straps 30a and 30b from one another. Master link 220, on the other hand, may be best suited to tracks having a different manner of coupling adjacent links together. In any event, the following description of master link 20 should be understood as generally applicable also to master link 220.
  • Master link 20 may be installed into a track such as track 14 for use by engaging straps 30a and 30b with pins, bushings, etc., and coupling link members 22a and 22b together via fasteners 36 such as bolts. Breaking of track 14 is achieved by loosening fasteners 36 to de-couple link members 22a and 22b, for example with wrenches, etc.
  • master link 20 will tend to operate similarly to any other track link. For instance, a load applied to one of link members 22a and 22b via a strap 30a, 30b will be transmitted via the abutting profiled surfaces 50a and 50b to the other link member 22a, 22b, and thenceforth to an adjacent track link via the other strap 30a, 30b.
  • profiled surfaces 50a and 50b, and the other radial surfaces of the respective link members are configured to distribute strain/stress during loading of master link 20 in a manner superior to known designs. This is achieved in part via sinusoidal segments 56 of the respective profiled surfaces 50a and 50a, and in particular by fashioning the radiuses defined by tooth 42a and recess 40a to be as large as possible.
  • the footprints of each of links members 22a and 22b are also tailored to optimally distribute stress, as described herein. Earlier single tooth designs typically suffer from an inability to optimally distribute strain during loading, as the mating surfaces between the link members either include transitions, e.g.
  • the profiled surfaces 50a, 50b, 150a, 150b may have a uniform surface finish, at least in their respective sinusoidal segments, as load transmitting between the abutting surfaces is contemplated to be substantially uniform along the sinusoidal segments due to proper sizing, blending, etc. of the radiuses and slopes.
  • middle segment 55 of sinusoidal segment 56 overlaps with the radiuses defined by tooth 42a and recess 40a over a majority of its length, or over all of its length.
  • middle segment 55 By designing middle segment 55 to have a flat portion which is less than a majority of its length, or nonexistent, the relative size of the respective radiuses may be made larger.
  • earlier single tooth designs include relatively large flats at the abutting surfaces between the components.
  • the embodiments described herein enable further strain distribution by providing relatively large radiuses in transitioning from a first width of master links 20, 220 near their straps to the relatively greater width in the vicinity of bores 38a, 38b, 238a, 238b. These features all combine to create a master link superior in performance, strength and reliability than earlier designs.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Transmission Devices (AREA)

Abstract

La présente invention concerne un maillon principal (20, 220) pour une piste (14) d'une machine (10) qui inclut un premier élément de liaison (22a, 222a) possédant une surface profilée (50a, 250a) avec un segment sinusoïdal (56) défini par une dent (42a, 42b, 242) et un renfoncement adjacent (40a, 40b, 240). Le maillon principal (20, 220) inclut en outre un second élément de liaison (22b, 222b) configuré de manière complémentaire par rapport au premier élément de liaison (22a, 222a), leurs surfaces profilées respectives (50a, 250a, 50b, 250b) définissant ensemble une interface d'appariement pour transmettre des charges entre ceux-ci. Une machine (10) inclut en outre une piste (14) possédant un maillon principal à une seule dent (20, 220) dans lequel des surfaces profilées (50a, 250a, 50b, 250b) sur des éléments de liaison adjacents définissent ensemble une interface d'appariement pour transmettre des charges à travers la piste (14), chacune des surfaces profilées (50a, 250a, 50b, 250b) possédant un segment sinusoïdal (56).
PCT/US2008/000409 2007-01-19 2008-01-11 Maillon principal pour piste de machine et procédé WO2008091499A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/655,499 2007-01-19
US11/655,499 US20080174175A1 (en) 2007-01-19 2007-01-19 Master link for machine track and method

Publications (1)

Publication Number Publication Date
WO2008091499A1 true WO2008091499A1 (fr) 2008-07-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/000409 WO2008091499A1 (fr) 2007-01-19 2008-01-11 Maillon principal pour piste de machine et procédé

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US (1) US20080174175A1 (fr)
KR (1) KR20080068586A (fr)
WO (1) WO2008091499A1 (fr)

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US9199678B2 (en) 2010-04-28 2015-12-01 Komatsu Ltd Crawler belt and master link for crawler belt

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US7877977B2 (en) * 2008-12-12 2011-02-01 Caterpillar Inc. Master link for a track chain
US9926024B2 (en) * 2010-06-29 2018-03-27 Caterpillar Inc. Master link joint for a track undercarriage and method of retrofitting an existing undercarriage
US9493199B2 (en) * 2014-10-08 2016-11-15 Caterpillar Inc. Master link mating surface cover
US10618103B2 (en) 2015-11-20 2020-04-14 Caterpillar Inc. Method for non-linear fracture splitting
US10457343B2 (en) * 2016-10-07 2019-10-29 Caterpillar Inc. Track chain assembly of undercarriage with link having increased pitch
US10407115B2 (en) * 2017-08-18 2019-09-10 Caterpillar Inc. Master track link having gapped teeth
US11618518B2 (en) * 2020-06-18 2023-04-04 Caterpillar Inc. Ground-engaging track for machine having multi-tooth master link
US12037064B2 (en) 2020-12-15 2024-07-16 Caterpillar Inc. Master link and articulated chain assembly for machine

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US4105260A (en) * 1975-08-04 1978-08-08 Caterpillar Tractor Co. Track shoe and bolt retention arrangement
US4365848A (en) * 1979-07-09 1982-12-28 Italtractor I.T.M. S.P.A. Connection link for endless chains of tracked equipment
US4457565A (en) * 1979-12-05 1984-07-03 Maurizio Bissi Two-piece master track link
US4351573A (en) * 1980-12-24 1982-09-28 Deere & Company Split master link for track of track-laying tractors
US4579394A (en) * 1983-09-16 1986-04-01 Deere & Company Split master link for track-laying vehicle track
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9199678B2 (en) 2010-04-28 2015-12-01 Komatsu Ltd Crawler belt and master link for crawler belt
US9481412B2 (en) 2010-04-28 2016-11-01 Komatsu Ltd. Crawler belt and master link for crawler belt

Also Published As

Publication number Publication date
KR20080068586A (ko) 2008-07-23
US20080174175A1 (en) 2008-07-24

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